Central-draft lamp



(No Model.) 2 Sheets-Sheet 1 J. E. BOHNER. CENTRAL DRAFT LAMP.

No. 439,718. Patented Nov. 4, 1890.

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(No Model.) 2 Sheets-Sheet 2., J. E. BOHNE'R. CENTRAL DRAFT LAMP.

N0.-439,718. Patented Nov. 4, 1890.

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UNITED STATES PATENT OFFICE.

JOSEPH E. BOHNER, OF CHICAGO, ILLINOIS.

CENTRAL-DRAFT LAM P.

SPECIFICATION forming part of Letters Patent No. 439,718, dated November 4, 1890.

Application filed April 2,1890- Serial No. 346,319. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH E. BOHNER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Central-Draft Lamps, of which the following is a specification.

This invention relates to that form of lamps or burners having a central air-draft and in which a round tubular wick is employed to form an annular flame; and the present improvements have for their object, first, to provide a simple and efficient construction of an air-distributer or flame-spreader for the upper end of the central draft or wick tube, embodying the features of a full and even distribution of the air-supply to the body or base of the flame, and an even mixture of the balance of the air-supply with top portion of the flame to insure a perfect and uniform combustion and produce a maximum amount of light with a minimum amount of smoke and smell, and, second, to afford an improved construction of the wick-adjusting sleeve and its connections, whereby the movement of the same in a direction parallel with the wicktubes is insured, the tilting and binding of such adjustingsleeve within the wick-chamber positively prevented, and a perfect and even feed or adjustment of the wickobtained. I attain such objects by the construction and arrangement of parts illustrated in the accompanying drawings, in which Figure 1 is avertical axial section of an ordinary central-draft lamp-burner to which my present improvements are applied; Fig. 2, a horizontal section of the same on line X X, Fig. 1; Fig. 3, a detail perspective view of the wick-adjusting sleeve and its guide-plate.

Similar figures of reference indicate like parts in all the views.

As represented in the drawings, the burner will be of the usual form, having an inner and outer tube 1 and 2, forming between them the annular Wick-chamber containing the tubular lamp-wick 3, the central draft-passage 1 drawing its supply of air through the crosstubes. 5, as usual.

The first part of the present invention con= sists in the provision in the interior of the perforated skirt 6 of the air distributer or spreader, and at or near the mid-height of said skirt of a horizontal check-plate, disk, or button 7 of a diameter less than the skirt 6 so as to leave a contracted annular space between the two, such disk acting as a check to the upward draft of air, causing the same to be deflected outward at and near the base of the flame to cause a more perfect combustion at such point, the remainder of the air passing up around the check disk 7 and out through the perforations in the upper part of the skirt to mix with the upper portion of the flame to complete the combustion. It is preferable, however, to discharge a large part of such ail-out in a radial horizontal direction through slits or passages left between the outwardly-flaring top of the skirt 6 and the overhanging spreader plate or cap 8 of the same. In this construction the plate or cap 8 will be formed with downward projections to rest on the top of the skirt and support the cap-plate the required distance above the skirt to form the above-mentioned slits or passages.

The check-disk 7 -may be supported in proper position by any suitable means-as, for instance, a suspension-rod 10, as shown, or by a supporting-rod extending up from the interior of the inn er wick-tube, or bya hollow suspension-sleeve 11, as also indicated by dotted lines, or in any other suitable way that may suggest itself to the constructer.

The second part of the present invention consists in the provision of a curved guideplate 12 within the wick-chamber and between the lower end of the wick-adjusting sleeve 13 and the wick, as shown, toform a support or guide for the downward extension of the adjustingsleeve at the side opposite to that upon which the rack is formed that meshes with and is driven by the pinion 14 and its operatingshaft, the ends of the curved guide being secured to the inner side of the outer wick-tube 2, as shown in Fig. 2, to form a narrow guide-space for the movement and guidance of the downward extension of the adjusting-sleeve to hold it to its engagement with its operating-pinion, and at the same time prevent in a very perfect manner any tendency of the sleeve to tilt or bind in the wick-chamber. As a consequence thereof .an even and perfect feed or adjust ment of the wick-sleeve is formed by cutting away the opposite sides of the sleeve directly over the draft-tubes 5, as indicated by dotted lines in Fig. 1, the purpose being to hold the toothed rack to its engagement with its operating-pinion.

I am aware that prior to my invention lampburners have been provided with a central air-conducting tube that extends up to near the top of the flame-spreader to deliver a supply of air to the same at such point, such tube being flared so as to more readily discharge the air-supply in an outward horizontal direction. I am also aware that the wick-adjusting sleeves of lamp-burners have been provided with racks that pass through suitable guides inside the Wick-tuhes. I therefore make no claim to either of such features of construction, broadly; but,

Having thus fully described my said invention, what Iclaim as new, and desire to secure by Letters Patent, is

1. The combination, with a central-draft lamp or burner, of an air-distributer having a perforated skirt and a horizontal check plate or disk of alesser diameter than the skirt and located in the interior of said skirt at a suitable distance above the wick-tube to form a contracted annular passage to the upper portion of the distributer, essentially as and for the purpose set forth.

2. The combination, with a central-draft lamp or burner, of an air-distribnter consisting of a perforated skirt, a spreader or capplate supported above the top of the skirt so as to leave a slit or passage between the same, and a check plate or disk of a lesser diameter than the skirt and located in the interior of said skirt at a suitable distance above the wick-tube, essentially as and for the purpose set forth.

3. The combination, with the wick-tubes of a central-draft lamp or burner, of the wickadjusting sleeve 13, having its opposite sides cut away over the draft-tubes 5 and provided on its outer surface with a vertically-arranged raek, and acurved guide-plate 12, secured t0 the outer Wick-tube and forming therewith a guide-space for the lower end of the Wick-adjusting sleeve to prevent a tilting or binding of the same Within the wick-chamber, essentially as described.

In testimony whereof witness my hand this 29th day of March, 1890.

JOSEPH E. BOI'INER.

In presence of GEORGE BOHNER, ROBERT BURNS. 

